Matt - I have seen both issues - a loose gas cap or a faulty DMTL pump. To be safe check the seals on your gas tank cap as well to make sure that it isn't broken, causing a poor seal when you tighten the cap. Let's hope your issue is not a faulty DMTL pump.
Here are great descriptions of the codes you received:
P1434 MINI FC (0x2736) - Detection Module for Tank Leakage [DMTL] - Tank Leakage
P1434 MINI FC (0x3220) - DMTL, System Fault - Abort Due to Current Fluctuations during Reference Measurement
Quote:
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That fault code refers to the fuel tank evaporative control system, which includes the carbon canister, plumbing for condensing fuel vapors, the purge solenoid valve, and the leak detection unit [DMTL] which pressurizes the fuel tank and evaporative system to monitor system leaks. The DMTL is mounted directly to the activated carbon canister, which is located underneath the vehicle.
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Report back if your issue presents itself again.